custom keyboard

I always misstype when it come to copy the carrier numbers into the app by hand...

What do you think about a custom keyboard with less, but bigger stuff.

I don't know if there is any use of special signs at all... otherwise it would be perfect to recognize the carrier (e.g. DHL just uses numbers and no other stuff at all - at least i recognized that the last few times - so why dont use a custom keyboard if i select dhl and just see 0-9 but really big and with a bit space in between?)

let us know what you think about improving the imput process...